Rail passengers will suffer more travel misery because of a fresh wave of strikes in bitter disputes over driver-only trains.
Members of the Rail, Maritime and Transport (RMT) union on Arriva Rail North will walk out for three days from Saturday.
Merseyrail members will walk out on Saturday and Monday.
Arriva North said it was planning to run 40% of services on revised timetables from 7am to 7pm on Saturday and Monday, and from 9am to 5pm on Sunday.
Most Merseyrail services are planned to run every half an hour from 7am to 7pm, although they will not stop at some stations.
Passengers were advised to check before they travel and warned that timetables could change during the industrial action.
Jan Chaudhry-van der Velde, managing director at Merseyrail, said: "The Merseyrail team has put together the best possible timetable that we can to provide a limited train service on both strike days. I would urge all our customers to check before they travel."
Sharon Keith, regional director at Northern, said: "We are doing everything we can to keep our customers on the move during the three days of industrial action affecting our network.
"We will be running more than 40% of our usual services, but those trains that do run will be on an amended timetable and are likely to be extremely busy. We ask our customers to plan carefully, allow extra time for travel, and to consider whether their journeys are necessary."
The union is campaigning against plans by Merseyrail and Arriva for new trains to be driver-controlled.